Update Doxygen Project Version

 * Change Project Version to 20.08

Signed-off-by: Ryan OShea <Ryan.OShea2@arm.com>
Change-Id: I02ceca1995bdefb98d73511748fb2142cd27969e
diff --git a/docs/Doxyfile b/docs/Doxyfile
index 6f4e3b0..7d20d0a 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -61,7 +61,7 @@
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 20.05
+PROJECT_NUMBER         = 20.08
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a